(E)-3-Ylideneoxindoles are prepared in methanol in reasonable to good yields, as adducts of photochemical 5-exo-trig of aryl radicals, in contrast to previously reported analogous radical cyclizations initiated by tris(trimethylsilyl)silane and azo-initiators that gave reduced oxindole adducts.
(E)-3-Ylideneoxindoles 在
甲醇中作为芳基自由基光
化学 5-exo-trig 的加合物制备,收率合理甚至很高,这与之前报道的由三(三甲基
硅烷基)
硅烷和偶氮
引发剂引发的类似自由基环化反应不同,这种环化反应得到的是还原型氧化
吲哚加合物。